Currently supported target JSON Schema versions are draft2020-12, draft2019-09, draft07,
draft06, draft04.
If you notice issues with any of those draft versions support, please file an issue here and / or a test case to JSON-Schema-Test-Suite which is used in this project to ensure correctness.
Additionally, a strict subset of discriminator is implemented.
draft03 and below are not supported, though for convenience some compatibility with it is present,
but it is advised to migrate the schemas to newer specification versions.
Most likely, any patches to improve draft03 support would be rejected.